I have AA tune for 2 months and I have just upgraded my 325i Auto with 3 stage intake manifold. I feel hiccup when accelerating at around 3500 - 4200 RPM. Feels like the car hesitance for 3 hiccups before accelerating strongly again. Any one experience this issue?

I know this post was a few pages back but I didn't see anything else after this. Was wondering if you fixed this issue?